public class Drawing_interface {
    public static void main(String[] args) {
//        quadrangle p = new parallelogram();
//        ((parallelogram)p).draw();
//        quadrangle s = new square();
//        ((square)s).draw();

        paintable p = new parallelogram();
        p.draw();
        paintable s = new square();
        s.draw();
        paintable c = new circular();
        c.draw();
    }
}
